質問 # 130
Which of the following API can be used to upload objects?
A. delete object
B. update object
C. get object
D. put object
正解：D
解説：
The put object API is the standard operation used in object storage systems (including Huawei OBS and S3-compatible platforms) to upload data. It allows a client to send a complete object - consisting of the data and its associated metadata - to the storage system in a single request.
This operation creates a new object if it does not exist or overwrites it if it already exists.
質問 # 131
Which vendors provide NAS active-active solutions?
A. HDS
B. Huawei
C. Dell
D. HPE
E. EMC
F. NetApp
正解：B、D、E、F
質問 # 132
A snapshot is a full copy of a LUN in SAN storage.
A. TRUE
B. FALSE
正解：B
解説：
In Huawei OceanStor systems, a snapshot is not a full physical copy of the data. Huawei uses a technology called HyperSnap, which typically employs a "Copy-on-Write" (COW) or "Redirect-on-Write" (ROW) mechanism.
When a snapshot is created, the system generates a point-in-time (PIT) logical image of the source LUN. It does not immediately duplicate the data blocks; instead, it records the state of the data at that specific moment. If data in the source LUN is subsequently modified, the original data is preserved (in COW) or new data is written to a new location (in ROW) to maintain the integrity of the snapshot. Because only the metadata and the changed blocks are managed, snapshots are created near-instantaneously and consume very little initial space.
A "full copy" would be referred to as a Clone (HyperClone) or a LUN Copy, both of which require a 1:1 ratio of physical storage space relative to the source and take significant time to complete. Therefore, a snapshot is a virtual, point-in-time image, not a full physical duplicate.
質問 # 133
Which statements about storage arrays are correct?
A. Cache buffers host data in a storage system and improves the performance and reliability of the storage system.
B. A controller is the brain of a storage array and its main components are a processor and cache.1/0 operations and RAID management functions are implemented first With the development of technologies, data management functions such as snapshot, mirroring, and replication are provided.
C. A storage array consists of multiple disks used as a single disk. It stores data in segments an different disks When data is stored, the related disks in the array work together to reduce the time required for storage and improve the space utilization.
D. Intelligent cache prefetch identifies the access mode of a host predicts the data to be accessed, and reads the data from disks in advance to improve the cache hit ratio.